class_docstr: Objects of this class can be passed to Plotly Express functions that expect column
  identifiers or list-like objects to indicate that this attribute should be mapped
  onto integers starting at 0. An optional label can be provided.
code: def __init__(self, label=None):
      self.label = label
  
file_path: catboost/contrib/python/plotly/py2/plotly/express/_special_inputs.py
label_desc: Use image node_id 1 to create a new Range object from inherited base classes: object with example: obj = Range(label)